Buggy code:
public class JJDoc extends Task { private static final String OUTPUT_FILE = "OUTPUT_FILE" ; private static final String TEXT = "TEXT" ; private static final String ONE_TABLE = "ONE_TABLE" ; private final Hashtable optionalAttrs = new Hashtable ( ) ; private String outputFile = null ; private boolean plainText = false ; private static final String DEFAULT_SUFFIX_HTML = ".html" ; private static final String DEFAULT_SUFFIX_TEXT = ".txt" ; private File target = null ; private File javaccHome = null ; private CommandlineJava cmdl = new CommandlineJava ( ) ; public void setText ( boolean plainText ) { } public void setOnetable ( boolean oneTable ) { } public void setOutputfile ( String outputFile ) { } public void setTarget ( File target ) { } public void setJavacchome ( File javaccHome ) { } public JJDoc ( ) { } public void execute ( ) throws BuildException { Enumeration iter = optionalAttrs . keys ( ) ; while ( iter . hasMoreElements ( ) ) { String name = ( ( String ) ( iter . nextElement ( ) ) ) ; Object value = optionalAttrs . get ( name ) ; cmdl . createArgument ( ) . setValue ( ( ( ( "-" + name ) + ":" ) + ( value . toString ( ) ) ) ) ; } if ( ( ( target ) == null ) || ( ! ( target . isFile ( ) ) ) ) { throw new BuildException ( ( "Invalid<seq2seq4repair_space>target:<seq2seq4repair_space>" + ( target ) ) ) ; } if ( ( outputFile ) != null ) { cmdl . createArgument ( ) . setValue ( ( ( ( "-" + ( JJDoc . OUTPUT_FILE ) ) + ":" ) + ( outputFile . replace ( '\\' , '//' ) ) ) ) ; } File javaFile = new File ( createOutputFileName ( target , outputFile , plainText ) ) ; if ( ( javaFile . exists ( ) ) && ( ( target . lastModified ( ) ) < ( javaFile . lastModified ( ) ) ) ) { log ( ( ( "Target<seq2seq4repair_space>is<seq2seq4repair_space>already<seq2seq4repair_space>built<seq2seq4repair_space>-<seq2seq4repair_space>skipping<seq2seq4repair_space>(" + ( target ) ) + ")" ) , MSG_VERBOSE ) ; return ; } cmdl . createArgument ( ) . setValue ( target . getAbsolutePath ( ) ) ; cmdl . setClassname ( JavaCC . getMainClass ( javaccHome , TASKDEF_TYPE_JJDOC ) ) ; final Path classpath = cmdl . createClasspath ( getProject ( ) ) ; final File javaccJar = JavaCC . getArchiveFile ( javaccHome ) ; classpath . createPathElement ( ) . setPath ( javaccJar . getAbsolutePath ( ) ) ; classpath . addJavaRuntime ( ) ; final Commandline . Argument arg = cmdl . createVmArgument ( ) ; arg . setValue ( "-mx140M" ) ; arg . setValue ( ( "-Dinstall.root=" + ( javaccHome . getAbsolutePath ( ) ) ) ) ; final Execute process = new Execute ( new org . apache . tools . ant . taskdefs . LogStreamHandler ( this , Project . MSG_INFO , Project . MSG_INFO ) , null ) ; log ( cmdl . describeCommand ( ) , MSG_VERBOSE ) ; process . setCommandline ( cmdl . getCommandline ( ) ) ; try { <START_BUG> if ( Execute . isFailure ( process . execute ( ) ) ) { <END_BUG> throw new BuildException ( "JJDoc<seq2seq4repair_space>failed." ) ; } } catch ( IOException e ) { throw new BuildException ( "Failed<seq2seq4repair_space>to<seq2seq4repair_space>launch<seq2seq4repair_space>JJDoc" , e ) ; } } private String createOutputFileName ( File target , String optionalOutputFile , boolean plainText ) { } }

Fix:
if ( ( process . execute ( ) ) != 0 ) {